RBSE Solutions for Class 10 Science Chapter 17 Search of Life Outside Earth
RBSE Solutions for Class 10 Science Chapter 17 Search of Life Outside Earth
Rajasthan Board RBSE Class 10 Science Solutions Chapter 17 Search of Life Outside Earth
Textbook Questions Solved
I. Multiple Choice Questions
Question 1:
What is the meaning of the term ‘alien’?
(a) Magic
(b) Extra terrestrial life
(c) Strange creature
(d) A cow-like animal
Answer:
(b) Extra terrestrial life
Question 2:
Where is the possibility of extra terrestrial life?
(a) On a star
(b) Anywhere
(c) On earth-like planet
(d) On any planet
Answer:
(c) On earth-like planet
Question 3:
Which was the first spaceship to go bevond the solar system?
(a) Chandrayan 2
(b) Mangalvan
(c) Pioneer 1
(d) Pioneer 10
Answer:
(d) Pioneer 10
Question 4:
Which apparatus is used for hearing whispers in space?
(a) Radio remote sensor
(b) Telescope
(c) Microscope
(d) None of these
Answer:
(a) Radio remote sensor
Question 5:
Where do you need to go to watch the sunrise 15 times in a day?
(a) Poles
(b) International Space Station
(c) Moon
(d) Mars
Answer:
(b) International Space Station
Search of Life Outside Earth Very Short Answer Type Questions
Question 6:
Where are some people living outside the earth?
Answer:
International Space Station
Question 7:
The problem of global warming has arisen because of which organism?
Answer:
Human
Question 8:
“The physical environment on earth and all organisms, together work as a living unit”. What is the name of this hypothesis?
Answer:
Gaia Hypothesis
Question 9:
The environment at the time of formation of earth-like planet was highly hot and explosive. How much time did it take to cool the things down?
Answer:
About one billion years
Search of Life Outside Earth Short Answer Type Questions
Question 10:
How many earth-like planets are possibly there in the Milky Way?
Answer:
There are about 1 billion solar systems in the Milky Way galaxy. Many of them have some earth-like planets. These planets may have suitable environment to sustain life. Hence, these planets hold the possibility of life.
Question 11:
What is the meaning of the term ‘alien’?
Answer:
Extra terrestrial life is called alien. Scientists assume that molecules which created life on the earth are available in plenty in different parts of the universe. Hence, possibility of alien life is pretty high. The alien life may be more developed or even less developed compared to variety of life on earth.
Question 12:
As per Darwin how was the first life form created on earth?
Answer:
After Darwin’s Theory of Evolution it became clear that the earth was formed like a hot sphere which cooled down in due course of time and an environment was created on it. Elements in the atmosphere combined to make simple compounds and eventually to complex compounds. These compounds also had some fundamental molecules for life, e.g. water, amino acid and nucleic acid. Condensation of these molecules instantaneously created the first life form.
Question 13:
Scientists were apprehensive about what at the time of launch of Pioneer 10?
Answer:
It was feared that the advanced alien civilization may attack Pioneer 10 after considering it as an attack by human civilization. Scientists feared that Pioneer 10 may be taken as an attack from inhabitant of earth and advanced alien civilization may retaliate against it.
Question 14:
What is the meaning of constructive and destructive forces?
Answer:
Constructive forces are forces which facilitate creation and sustenance of life on a celestial body. Destructive forces are forces which do not facilitate creation or sustenance of life on a celestial body.
Search of Life Outside Earth Long Answer Type Questions
Question 15:
What was our concept about extra-terrestrial life at the time of launch of Pioneer 10? What step was taken to save us from imaginary apprehensions?
Answer:
By the time Pioneer 10 was launched in 1972 many scientists began to develop a strong belief about possibility of more advanced life on other celestial bodies. Some scientists were also apprehensive of possible attacks from alien civilizations. Pioneer was to go beyond our solar system after passing through near Jupiter. It was anticipated that pioneer may come in contact with any advanced civilization during its eventual voyage.
It was feared that the advanced civilization may attack Pioneer 10 after considering it as an attack by human civilization. A plate was fixed on Pioneer 10 to rule out this misconception. The plate showed figures of a man and a woman with friendly posture and a message in sign language to show the real intention of voyage of Pioneer 10.
Question 16:
Explain a day at the International Space Station by assuming yourself as an astronaut.
Answer:
I got up at 5:00 AM Greenwich Mean Time (GMT). It was time to finish the early morning
chores. I strapped myself to the toilet seat. After that I sucked some toothpaste from the tube and brushed my teeth. This was followed by a 30 minute jogging on treadmill. Breakfast was served in plastic tubes with colour-codes on them. The breakfast was nutritious but tasted awful. After that, it was time to move to another chamber which had state of the art laboratory. Along with my fellow astronauts, I conducted an experiment about plant’s growth in zero gravity. During the break, I took photos of earth which was passing by at frequent intervals. During night, India was looking like a jewel fitted with glittering stones. After a hard schedule of about eight hours, it was time to take rest.
Question 17:
How do the scientists think about extra terrestrial life? What are your thoughts on this topic?
Answer:
Latest scientific researches show that there are one billion earth-like world and many of them are rocky like earth. There are about 100 billion galaxies in the known universe. The senior scientist from NASA, Allen Stephen says that we have solid proof to tell that we shall be able to find extra terrestrial life in the coming decade.
People from the scientific community also believe that the extra-terrestrial life is abundant in number. It keeps on coming continuously on earth in the form of microorganisms. Scientists also believe that the first life form was not created on earth rather came from somewhere else. Another group of scientists thinks that there is possibility of life outside the earth but that may not be as developed as on earth. They believe that only having a rocky planet with water is not enough to sustain life.
I think that alien life can be in different stages of development. At some planet, the alien life may be highly advanced. At others, it can be in the form of microorganisms only.
Question 18:
Explain the importance of artificial satellites.
Answer:
Following is the significance of artificial satellites:
- Valuable data is obtained about atmosphere and troposphere.
- Signals for television and radio are transmitted by artificial satellites.
- Modern telecommunication system is fully dependent on artificial satellites.
- Internet could be developed because of these satellites.
- Better forecast of weather is now possible.
Question 19:
What is the significance of India in the field of space research?
Answer:
India is among the top countries in the field of space research. India has developed state of the art rocket launchers and satellites. India has developed the capability to make SLV, PSLV and GSLV; the vehicles for satellite launches. India has been doing this at a fraction of cost at which developed nations are able to do. Hence, satellite launch from India is highlv cost effective. This has attracted many nations to India and has enabled ISRO to earn huge amount of foreign exchange.
India has sent many satellites into space. These satellites are being utilized for collecting data so that weather forecast can be accurately done. Moreover, Indian satellites are also helping in transmitting signals for radio, television, mobile telephones, internet, etc. This is helping in proper functioning of business and commerce.
Search of Life Outside Earth Additional Questions Solved
I. Multiple Choice Questions
Question 1:
How many solar systems are there in the Milky Way?
(a) One million
(b) One billion
(c) One trillion
(d) One thousand
Answer:
(b) One billion
Question 2:
Who was the first man to go into space?
(a) Yuri Gagarin
(b) Edwin Eldrin
(c) Neil Armstrong
(d) Rakesh Sharma
Answer
(a) Yuri Gagarin
Question 3:
Who was the first man to step on moon?
(a) Yuri Gagarin
(b) Edwin Eldrin
(c) Neil Armstrong
(d) Sunita Williams
Answer:
(c) Neil Armstrong
Question 4:
Which was the first Indian satellite?
(a) Bhaskar
(b) Rohini
(c) Aryabhata
(d) Indira
Answer:
(c) Aryabhata
Question 5:
Which of the following is the main space agency in India?
(a) ISRO
(b) NASA
(c) COSMOS
(d) ARIANNE
Answer:
(a) ISRO
Search of Life Outside Earth Very Short Answer Type Questions
Question 1:
What is the full form of NASA?
Answer:
National Aeronautic and Space Administration
Question 2:
What is the full form of ISRO?
Answer:
Indian Space Research Organisation
Question 3:
What is the full form of SLV?
Answer:
Satellite Launch Vehicle
Question 4:
What is the full form of PSLV?
Answer:
Polar Satellite Launch Vehicle
Question 5:
What is the full form of GSLV?
Answer:
Geosynchronous Satellite Launch Vehicle
Question 6:
What is the name of our own galaxy?
Answer:
Milky Way
Question 7:
ISRO was earlier known by which name?
Answer:
Indian National Committee for Space Research (INCOSPAR)
Search of Life Outside Earth Short Answer Type Questions
Question 1:
Write a short note on initial space missions of USSR.
Answer:
USSR took the initiative and sent the first man-made satellite Sputnik – 1 in October 1957 into space. Sputnik -1 orbited around the earth while maintaining a distance between 939-215 km from the earth. The radio transmitters on Sputnik -1 sent data about higher level of atmosphere, in the form of beeps. It was burnt into pieces while entering the earth. USSR went further ahead and took the lead in sending the first animal, first man (Yuri Gagarin), exhibiting first spacewalk, landing an unmanned spaceship on a celestial body, and installing the space station named Salute-1.
Question 2:
Comment on the beginning of space research in India.
Answer:
The space research in India started in 1948 in the form of Physics Research Institute, Ahmedabad. The effort got a boost when the government of India established Indian National Committee for Space Research (INCOSPAR) in 1962 under the leadership of Dr. Vikram Sarabhai. This committee established Thumba Rocket Launching Station and started space research on upper levels of atmosphere. Indian Committee for Space Research was renamed a Indian Space Research Organisation (ISRO) in 1969. ISRO has been at the forefront of developments in space technology since its day of inception.
Question 3:
Write a short note on private initiatives in the field of space research.
Answer:
Many private agencies have also started taking interest in space. Their main objective is to explore space tourism to earn money. Google has announced the Lunar Ex Award to encourage such efforts. Team Indus is working hard to land a robot on the moon, to win the prize from Google. A company; called Moon Express has obtained permission from NASA to ferry people from earth to moon. It can be possible that some people may be fortunate enough to enjoy a journey to the moon in 2017. The co-founder of this company, Navin Jain says that space exploration would benefit industries, like diamond, energy, mining, etc. Fuel stations shall be established on the moon to facilitate travel to the deeper space.
Question 4:
How do the astronauts get food and drink?
Answer:
Food for each astronaut is sent in plastic bags with an individual’s hame written on the bag. There are some arrangements for warming or cooling the food. But food becomes bland in taste after some time. In that situation, astronauts wait for fresh supply from the earth. Drinks are sucked directly through a straw.
Question 5:
What are the harms of living in space?
Answer:
Living in weightlessness for a long duration has a lverse effects on the health of astronauts. They resort to regular exercise to prevent such adverse effects. Treadmills and other equipments have been installed in the space station for this purpose. Living in a small chamber in the faraway space with a few colleagues can also have deleterious effect on psychology of the person.
Search of Life Outside Earth Long Answer Type Questions
Question 1:
Explain the successes which India has achieved in the field of space technology.
Answer:
India has been successful in improving the capability of its rockets. India quickly made its own space launch vehicle-3 (SLV 3) which was capable of carrying Indian satellites into space. The first launch of SLV 3 was unsuccessful but after learning from this, scientists were able to successfully send the satellite Rohini into space.
Indian satellites are helping in transmission of signals for radio, telephone, internet, television, telemedicine, distant education, etc.
India has also been successful in developing Polar Satellite Launch Vehicle (PSLV) which is a powerful rocket. This vehicle can install a satellite to orbit the poles of the earth. A PSLV is highly reliable and hence majority of countries want to use this for launching their spaceships. Indian PSLV is highly cost effective and hence is an attractive option for other countries. India has also developed its Geosynchronous Satellite Launch Vehicle (GSLV) which is utilized to send geosynchronous satellites. India has also sent a successful mission to the moon, named Chandrayan. India was acclaimed around the world when its scientists tasted success in sending a spaceship to the orbit of Mars. This was named as Mangalyan. It was adjudged as the best invention of 2014 because India could send a mission to mars at roughly one tenth of the cost at which other countries have been working.
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